Two-wire fire sensing and receiving system

Details Two-wire fire sensing and receiving system Two-wire fire sensing and receiving system

1978-06-27

1980-08-26

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340584, 340630, 323 22T, 323 22Z, G08B 1710, H01H 7174

Patent

active

042198038

ABSTRACT:
A two-wire fire sensing and receiving system having a plurality of fire sensors connected in parallel in which;
the difference in current level between a feeding electric current of a relatively small level for controlling the system and a sensing current of a relatively high level for causing the switching element of an alarm device to be conductive is reliably maintained to distinguish their current levels by restraining the current which tends to increase at the beginning of capacitor charging and at intermittent charging periods within the level of the feeding electric current without being affected by the fluctuation in power supply voltage.

REFERENCES:
patent: 3214668 (1965-10-01), Brinster
patent: 3604960 (1971-09-01), Krestel
patent: 3634839 (1972-01-01), Vassil et al.
patent: 3678511 (1972-07-01), Benedict
patent: 3964036 (1976-06-01), Adachi et al.
patent: 3979600 (1976-09-01), Bohning
patent: 4041479 (1977-08-01), Miyabe
patent: 4065759 (1977-12-01), Handing
patent: 4100479 (1978-07-01), Buck

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